S70 Radiator fan
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S70 Radiator fan
-99 S70 -2.5 Five speed 144 Hp
With 100+ deg C on thermostat manifold the radiator fan does not turn on and temp gauge show normal temp (not elevated).
New thermostat and coolant temp sensor just installed.
How best to troubleshoot/by your experience what is the problem?
With 100+ deg C on thermostat manifold the radiator fan does not turn on and temp gauge show normal temp (not elevated).
New thermostat and coolant temp sensor just installed.
How best to troubleshoot/by your experience what is the problem?
Senior Member
Joined: May 2012
Posts: 1,988
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From: Kingsport, TN
I'm not sure it needs to come on at that temperature. If you've already figured that out, I apologize. I'm just not sure. Anyway, I'm a fundamentalist, so I would be looking at the fan and fan relay doing experiments on both to see that they work, and so then I would use a scan tool to see what temperature the car thinks it is. You can see when the ECU calls for the fan by probing that wire, but let's face, it if the fan works you won't have to. If the ECU never calls for the fan, it's hard to say what a person could do about that.
Does the air conditioning work? That is an easy way of getting the fan on when the a/c works.
I seldom or never mention this, but Volvos have a "lying" temperature gauge. It always shows the same indication, dead center, over a very wide range of temperature. This is easy to do as the cluster is all digital. It's not a real gauge. It does what it's programmed to do. There is a temperature where it will quickly zoom up to "hot", but I'm not sure what that temperature is. The gauge was designed that way to stop customers from worrying about it. Back when more people daily drove these cars, the "lack of warning" was a common cause of concern here in this forum. Many volvos died simply through tiny heater core leaks. Even when owners knew it was leaking, they would let it get a little too low one day and boom.
Does the air conditioning work? That is an easy way of getting the fan on when the a/c works.
I seldom or never mention this, but Volvos have a "lying" temperature gauge. It always shows the same indication, dead center, over a very wide range of temperature. This is easy to do as the cluster is all digital. It's not a real gauge. It does what it's programmed to do. There is a temperature where it will quickly zoom up to "hot", but I'm not sure what that temperature is. The gauge was designed that way to stop customers from worrying about it. Back when more people daily drove these cars, the "lack of warning" was a common cause of concern here in this forum. Many volvos died simply through tiny heater core leaks. Even when owners knew it was leaking, they would let it get a little too low one day and boom.
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Joined: Jun 2024
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I'm not sure it needs to come on at that temperature. If you've already figured that out, I apologize. I'm just not sure. Anyway, I'm a fundamentalist, so I would be looking at the fan and fan relay doing experiments on both to see that they work, and so then I would use a scan tool to see what temperature the car thinks it is. You can see when the ECU calls for the fan by probing that wire, but let's face, it if the fan works you won't have to. If the ECU never calls for the fan, it's hard to say what a person could do about that.
Does the air conditioning work? That is an easy way of getting the fan on when the a/c works.
I seldom or never mention this, but Volvos have a "lying" temperature gauge. It always shows the same indication, dead center, over a very wide range of temperature. This is easy to do as the cluster is all digital. It's not a real gauge. It does what it's programmed to do. There is a temperature where it will quickly zoom up to "hot", but I'm not sure what that temperature is. The gauge was designed that way to stop customers from worrying about it. Back when more people daily drove these cars, the "lack of warning" was a common cause of concern here in this forum. Many volvos died simply through tiny heater core leaks. Even when owners knew it was leaking, they would let it get a little too low one day and boom.
Does the air conditioning work? That is an easy way of getting the fan on when the a/c works.
I seldom or never mention this, but Volvos have a "lying" temperature gauge. It always shows the same indication, dead center, over a very wide range of temperature. This is easy to do as the cluster is all digital. It's not a real gauge. It does what it's programmed to do. There is a temperature where it will quickly zoom up to "hot", but I'm not sure what that temperature is. The gauge was designed that way to stop customers from worrying about it. Back when more people daily drove these cars, the "lack of warning" was a common cause of concern here in this forum. Many volvos died simply through tiny heater core leaks. Even when owners knew it was leaking, they would let it get a little too low one day and boom.
My thought is that when the car was overheating, the radiator fan was probably running continously for a long time and possibly the main 60 A fan fuse went zip. Waiting for a new fuse to come in before opening the main fuse box - battery disconnect etc..
About that "analog" temp gauge, man, I am Swedish and that is frigg'n embarassing!!
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